Piston refinishing machine



Jan. 5, 1932- c. T. ROTTLER PISTON REFINISHING MACHINE Filed July 7, 1950 5 Sheets-Sheet 1 gmvntoz Clarence TRolf/er Jan. 5, 1932. c ROTTLER 1,839,775

PISTON REFINISHING MACHINE Filed July 7, 1930 5 Sheets-Sheet 2 arena? Ziioflier KM 11% abtomg Jan. 5, 1932. c. T. ROTTLER PISTON REFINISHING MACHINE Filed July 7, 1950 5 Sheets-Sheet 4 4 L- L J TRolWer 75 Clarence Jan. 5, Q ROTTLER 1,839,775

I PISTON REFINISHING MACHINE Filed July 7. 1950 5 Sheets-Slieet 5 Clarence Tfiohler Patented Jan. 5, 1932 r warren sr T s CLARENCE T. ROTTLER, or SEATTLE, WASHINGTON PISTON REFINISHING: MACHINE Application filed July 7, 1930. Serial No. 465,948; p s

My invention relates to'machine tools, and is particularly intended as a machine for working upon semi-finished pistons of internal combustion engines, to grind them, and

to machine them down. Y

One of the objectsof my invention is to provide a machine of this general character which shall-be compact, requiring but little floor space, which shall be convenient for the 7 i0 workman to do the work and to set up the work therein, and in which it is possible for the workman either to machine off the work or to grind it, without resetting the Work.

Among the more specific objects of my invention are to provide a compact and precise support for the tools, adjustable axially of the work as well as transversely thereof; to provide'in association with such a tool support a power feed therefor which can be 6111- ployed or not as desired; to provide a simplified means for supporting a dead center whereby it is movable axially rapidly and by hand; to provide a means for adjusting such a dead center transversely relative to the axis of the live arbor, to adapt the machine for the reception and working upon pistons which have their axes slightly inclined; to provide an improved drive means for a r0- tarytool, as a grinder, and to provide a belt tightener for use therewith; to provide a con-.- venient means which 1s not 111 the way of other parts, and for counterbalancing and supporting the tools and the drive means therefor; to provide adjustment and indicaters as needed in association with the various adjustable parts of the machine.

In general, it is my object to provide a simple, compact machine, in which there is'the capability of making the finest adjustments that would ever berequired upon such work, to the end that it may be adapted to all types and sizes of pistons. and capable of doing all of the operations that might be required tobe done thereupon My invention comprises the novel parts and the novel, combination and. arrangement thereof, as shown in the accompanying drawwill be more particularly pointedout by the 59 claims which terminate'thesamer 5-5 of Figure 4.

- upon the base 50, the drive means being, genings, described in this specification, and as In' 'theaccompanying drawings I have shown my invention in a form which is now preferred by me, it being understood that various modifications may be made therein M without departing from theprinciples of my invention, as set forth'inthe claims.

Figure 1 is a general right-side elevation of my machine, the operators stationbeing at left. 7 j i Figure 2 is'a left-side elevation of my ma- 15o chine, drawn to an enlarged-scale. Figure? is a front elevation of my machine. I "i Figure 4 is a transverse horizontal section a through my machine on the general line 4 1 b5 of Figure 2. I I

Figure 5 is an axial section through the oscillatablesleeve and its support on the line Figure 6 is :a transverse horizontal sectio on the line 66 of Figures 3 and 7.

Figure 7 is a vertical axial section through the driving arbor and itsvdrive means and parts associated therewith, taken on the line 7-7 of Figure 6. i I t Figure 8 is a transverse detail section on the line 88 of Figure 2.

The live arbor 1 is supportedin suitable hearings in a base generally designated by the numeral '50, the shaft being held-in a vertical position therein. Its upper end is bifurcated as indicated at 10,1for a'purpose which will appear hereafter. It is suitably driven from a motor 11, likewise supported '85 erallyspeaking, anythat may be found suitable. Those shown comprise a horizontal drive shaft 12, coupled to the shaft of the motor 11,1and'carrying a worm pinion 13, which meshes with a worm gear 14 at the lower end of the arbor 1. c

Aligned with the axis of the arbor 1 is a dead center 2 carried at the lower endof a rod 20,1which is slidable vertically within a vertical bore 21 at the outer end of an arm 22; This rod 20 is movable by hand toward and from the olive arbor 1, and may be clamped. in any selected position by means of a clamping screw indicated at23, which maybe of; any usual or. ordinary construc- '1 tion. This mounting permits rapid adjustment by hand of the dead center, its weight causing it to drop into place and to engage with the work, except as it is restrained by hand.

While the live arbor l is supported upon the fixed frame 50, which in turn is secured upon the standard 51, the arm 22 is supported upon the upper end of a post 5, which is preferably made hollow, and which projects upwardly from the base-5O and. the standard 51. A key 52 is formed upon this post, and the inner end of the arm 22 is split and embraces this post 5, having a key-way which receives the key 52. A clamping screw 53 (see Figure 8) serves to clamp the arm 22 at any selected position within the space permitted at the upper end of the post 5, and the engagement of this arm with the key 52 prevents turning of the .arm relative to the post, and hence, holds the dead center 2 substantially in alignment with the axis of the live arbor 1.

Itoccasionally happens that a piston was improperly finished originally and has an axis which is somewhat inclined with respect to its walls and end, .and in order that it shall not be necessary for the workman to completely refinish and out clown suclrapiston, and for other purposes it is desirable that the dead center 2 be adjustable to a slight degree transversely of the axis of the liverarbor 1. As a means of accomplishing this end, I may, provide a micrometer ad justing screw 24 threaded in the inner end of' the arm 22 and bearing against one side of the key 52. Opposing this is a member 25 backed by 'a spring 26; movement of'the screw 24 in opposition to this spring 26 will .force the outer endof the arm 22 to one side,

and slacking otf on the screw 24 will cause the arm to'swing to the opposite side under the influence of the spring 26. Such movement of the screw 24 may be accomplished andmeasured by an index arm 27 cooperating with an index scale 28 on the arm 22. It will be understood that during such adjustments the clamping screw 53 would be released or slacked off. 7

A piston P is supported upon thearbor 1,

its'skirt resting upon a tapered seat 15 car-- ried by the arbor 1. Such seats may be interchanged for different sized pistons. Within the bifurcation L 10 is loosely held a transverse key 16}, which is also loosely-received between the bosses in theinteriorofthe piston, and by this means, the piston being seated upon the tapered seat '15 and held by the dead center 2, it maybe rotated upon rotation of the arbor 1. v i Positioned to operate upon piston or other work thus held betweenthe live arbor land the dead center 2, is tool'or tools; for

thep'iston'P; The arm 36 is held in a supsecured to the post.

porting collar 31 by a set screw 32 and a lock nut 33, so as to permit its adjustment lengthwise of the arm 30 and about the axis thereof. This collar 31 is supported from the post 5 in such manner as to permitthe axial movement of the tool heretofore referred to, and its oscillation about the axis of the post. There may be likewise supported from the collar 31 a grinder wheel 4, carried with a hood 40, supported upon an arm 41 projecting from the sleeve 31, preferably at the opposite side of the work from the tool holding arm 30. Rotation of the grinder 4 may be accomplished by means of a. flexible member such as the belt42, connecting a pulley on the shaft which carries the grinder wheel 4 with a driving pulley 43 on the end of a vertical motor shaft, the motor 44 being supported from the collar 31. As a means of supporting this motor and of maintaining the belt 42 tight I mount the motor upon a base 45, which is supported upon a pivot pin 46, by means of which it is pivotally connected to the collar 31 to swing about a vertical axis. A spring 47 between the collar 31 and the frame 45 acts to tighten the belt 42.

The collar 31 is not mounted directly upon the post 5, but upon a sleeve 6. 'This sleeve is so mounted as to be selfcentering, that is,

"co-axial with the post 5,-and for this purpose t is provided with tapered or coned ends at 'top and bottom, within which fit complementally tapered or coned centering rings 61 Carried by thesleeve 6 are keys, preferably two being provided at opposite sides, and these are indicated at 62. The collar 31 is provided with a suitable key-way, within which are received the keys 62. I provide a means for very finely and accurately adjusting the collar relative to the axis of the sleeve 6. Such means may include the guide rollers 63, which engage the outside of one of the keys 62. These guide rollers arecarried in plates 64, and set screws or adjusting screws 65 are received in the plates 64 and bear against'the collar 31 to adjust the guide rollers slightly inwardly or outwardly; Holding screws 66 retain these guide rollers in adjusted position (see Figure 5). j 7

At the bottom end of the sleeve 6' is a worm geared quadrant or segment 67, with which is meshed an adjusting or oscillating worm 68, upon a shaft 68, the rotation whereof is controlled by 'a hand wheel 69. Manipulation of the hand wheel 69 causes the sleeve 6 to oscillate upon its axis, this action swinging the tools 3 and 4' transversely of the aligned axes of the live center 1 and dead center 2. I

In order to feed or traverse the tools over the work, it is necessary that the collar 31 be vertically movable, such action being permitted by the guide rollers 63, and the auxiliary guide rollers 63. To this end I have provided a transverse or circumferential groove 34, in the collar, within which is received a key 35 carried byanut 36. A feed screw 37 is carried inbearing provided in an ear 29 upon the arm 22, andin a correspondlng bearing in the frame 5-0. Bevel gears 38 within the'bas'e 50 permit rotation of the feed screw 37, by means of a hand wheel 39. g

The weight of the collar 31, of the tools 3 and 4, supported thereon, together with the driving motor 44, would be different to handle through the medium of a single feed screw, were it not for the fact that thiswe'ight is counter-weighted. The counter,- weight 9 is received within the hollow post and is supported by a cable 590 secured to the collar 31 or to the motor base 45, and passing over'a guide pulley 91, supported in ears 92 at the top of the hollow post- 5. The standard 50 may likewise be hollow to receive the counterweight 9.

At times it maybe desirable to achieve automatic power feed of the tools, and to enable this I have provided aworm gear 16 upon the arbor l, meshing with a gear 8 which is loosely supported upon the shaft 39 which carries the hand wheel 38. This gear 8 has formed therewith a clutch surface or member, with which a complemental clutch member 80 may be engaged. ,This member 80 is slidable along the shaft 39 and rotative therewith by means of the 'pin 81, engaged by the head 82 within the hollow shaft 39, the movement of which head is controlled by a screw 83 (see Figure6). So long as the clutch member 80 is disengaged from the gear 8, the feed screw 37 is not driven, but may be turned by the hand wheel 39. Upon engagement of this clutch member 80 with the gear 8, the latter, which is al-' since it forms no essential part of the present invention, and any siutable form of clutch may be employed in such a location.

While the sleeve 31 may be oscillated to either side of a normal neutral position, where neither the tool 3 nor the grinder wheel 4 is engaged with the work, it is desirable to provide means tending and assisting to return the same to this normal neutral position. balanced springs 7 5,. engageable with the sleeve 31. The engagement shown isindirect, through the medium of, a lever 76, at its upperend engaging a pin 77 carriedat To that end, I have provided opposed the lower end of the sleeve 6. The outer ends of the springs 38 are anchoredto the base 50. It is desirable that oil be supplied to the tools, and to this end I have shown a pump 95 driven. by the pair of gears 96, one of which is on-the pump-shaft and the other of which is on the main driveshaft 12. Oil'is delivered through the conduit 97 to the hood 40, and as it runs down over. the work it is caught in the basin 98, whence it returns to the supply tank 99, from which it is drawn ,by the pump 95. p Thechand wheel 69, it will be remembered,

controls the oscillation of the sleeve 6 and Lcollar 31 from a normal neutral position, and inorder to indicate the amount by which t has been turned, I may provide a rotary micrometer indicator 85, supported from the base 50, the same havinga pinion 86, with which is meshed a gear 87 carried upon the same shaft 68' which carries the hand wheel 69 and the adjusting pinion 68. An index finger 88, associated with the micrometer indicator 85, shows the amount by which the collar 31 has been deflected from its normal neutral position, and in which direction.

What I claim asmyinvention isz.

1. In a machine of the character described, 1

a base, an upright post supported therein, a

vertical axis live center and driving means therefor carried by said base, a dead center and means for supporting the same on the upper. end of said post, a sleeve centered on said post between thebase and the dead center support, a collar guided for movement lengthwise of said sleeve, means for adjusting said collar upon said sleeve, a tool carried by said collar and operable upon work held between the live and dead centers, and means for oscillating said sleeve to relative to the work. 7

2. In a machine of the character described, a base, an upright post supported therein, a

vertical axis live center and driving means therefor carried by said base, a dead center and means for supporting the same on the upperend of said post,.micrometer adjusting meansfor adjusting said dead center and its support transversely of the post and the live center axis, a sleeve centered on said post be- J tween the baseand the dead center support, a collar guided for movement lengthwise of said sleeve, means for adjusting collar upon said sleeve. a-tool carried by said collar and operable uponwork held between the live and dead centers, and means-for oscilswing the tool lating said sleeve to swing the tool relative V to the'work. I

3. A'rnachme as inclaim 1, the deadcenter supporthavmg avertical bore adapted for alignment with the'aXis of the live center,

and the dead center comprising a cally slidable in said bore, and means forsecuring the dead center rod-in any selected position.

rod verti- 4. In a machine of the'character described, a base, an upright post supported therein, a vertical axis live center and driving means therefor carried by said base, a dead center 7 an adjusting screw and hand wheel operaand means for supporting the same on the upper end of said post, a sleeve centered on said post between the base and the dead center support, a collar guided for movement lengthwise of said sleeve, means for adjusting said collar upon said sleeve, a rotary tool carried by said collar and operable upon work held between the live and dead centers, a driving motor for said tool, a flexible drive member connecting said motor and tool arbor, a base carrying said motor, and pivotally mounted upon said collar, and spring means acting upon said base to tightensaid flexible driving member.

5. In a machine ofthe character described, a base, an upright post supported therein, a vertical axis live center and driving means therefor carried by said base, a dead center and means for supporting the same on the upper end of said post, a sleeve centered on said post between the base and the dead center support, a collar guided for movement lengthwise of said sleeve, means for adjusting said collar upon said sleeve, a tool carried by said collar and operable upon work held between the live and dead centers, a gear quadrant carried by the base of said sleeve, and an adjusting screw andhand wneel operatively connected to said quadrant, to oscillate said sleeve and the tool carried thereby, relative to the work.

6. In a machine of the character described, a base, an upri ht post supported therein, a

vertical axis live center and driving means therefor carried by said base, a. dead center and means for supporting the same on the upper end of said post, a sleeve centered on said post between the base and the dead center support, a collar guided for movement lengthwise of said sleeve, means for adjustingsaid collar upon said sleeve, a tool carried by said collar and operable upon work held between the live'and deadcenters, a gear quadrant carried by the base of said sleeve, an adjusting screw and hand wheel operatively connected to said quadrant, to oscillate said sleeve and the tool carried thereby,relative to the work, a pin projecting from said sleeve,

a leverengaglng said pin, and balanced springs engageable with said lever,tending to return the sleeve into a normal neutral position.

7. In a machine of the character described, a base, an upright post supported therein, a vertical axis live center and driving means therefor carried by said base, a dead center and means for supportingthe same on the 7 upper end of said post, a sleeve centered on said post between the base and the dead center support, a. collarguided for movement lengthwise of sald sleeve, means for'adjust- I ing said collar upon said sleeve, a tool carried by said collar and operable upon work held between the live and dead centers, a gear quadrant carried by the base of said sleeve,

means therefor carried by said base,'a deadcenter and means for supporting the same on the upper end of said post, a sleeve supported onsaid post for oscillation about its axis, a collar guided for movement axially of said sleeve, means for adjusting the collar along the sleeve, a tool carried by the collar and 0p erable upon the work held between the live and dead centers, means for oscillating the sleeve to bring the tool relative to the work,

a counterw ht within said hollow post, and,

m a flexible member connecting said collar and said counterweight. v

9. A machine as in claim 1, the collar having a horizontal groove, a gib received in said groove, a vertical adjusting screw threaded in said gib, and journals for said screw fixed relative to said post. v

10. A machine as 1n claim 1, the collar having a horizontal groove, a gib received in said groove, a vertical adjusting screw threaded in said gib, ournals for said screw fixed relative to said post, a hand wheel operatively connected to turn said screw, and power drive means in said base likewise connected to said screw, and including clutch means operable to connect or disconnect the same with respect to the screw.

11. In amachine of the character described, a base, an upright post supported therein, and iaving a key in its upper endaa vertically disposed live arbor and driving means therefor carried by said base, an arm having a split end embracing the upper end of said post, and having a keyway fittin said key, a clampscrewfor retaining said arm in position upon said post, a dead center carried by said arm in substantial alignment with the live arbor, and micrometer adjusting means for adjusting said supporting arm and its dead center transversely of the axis of the live arbor.

12. A machine as in claim 11, the micrometer transverse adjusting means comprising a screw threaded in the arm and bearingagainst one side of the key in the post, and an opposin'g spring in the arm bearing against the opposite side or the key.

13. In a machine of the character described, a base, an upright "post supported therein, a vertically disposed live arbor'and driving means therefor carried by said base, an

aligned dead center andmeans for supporting the same upon the upper end of said post, a sleeve supported upon said post for oscillation about its axis, said sleeve having a vertical key, a collar movable axially of the sleeve, guide rollers on said collar engaging said key, means for adjusting said guide rollers toward and from the key, means for adjusting the collar along the sleeve, a tool carried by the collar and operable upon work held between the live and dead centers, and means for oscillating the sleeve to swing the tool relative to the work.

14. A machine as in claim 13,theguide rollers being carried on plates, an adjusting screw in each of said plates and engaging the collar to space its respective plate more or less therefrom, and holding screws received in said plates and said collar, to maintain the plates and rollers in adjusted position.

15. A machine as in claim 1-,the sleeve having tapered ends, and its mount-ing including two correspondingly tapered rings held upon the post, in engagement with the tapered ends of the sleeve.

Signed at Seattle, Washington,'this lstday of July, 1930. V

CLARENCE T. ROTTLER. 

